How to add “xing” social button to the social profile?

In order to add this social icon you should edit GGT Composer Addon. Open directory wp-content\plugins\ggt-composer-addon\includes\modules\ and edit file teammembers.php. Find this string "GitHub" => "github", and paste after it this one"Xing" => "xing". Now you have possibility to add Xing social link.